C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4521
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     Compiler warning (level 3) C4521
 
     'class' : multiple copy constructors specified
 
     There were multiple copy constructors of a single type specified
     for the given class. The first constructor was used.
 
     Make sure that there is only one copy constructor defined for
     a type and distance.
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